I'm a NEW kid on the block.....I own a 96 Jeep XJ w/a 4.0L 6 cyl. with 105,250 miles on the motor. My HHO generator puts out about 1.3LPM. The amp meter is showing about 18 amps after warming up. I just purchased your Dual Digital Narrowband EFIE to compliment my generator and I would like to know where to set my EFIE at on the Upstream side........AND Downstream side to SEE some INCREASES in MPG's. I'm getting around 62-70mv out of the Upstream side from the O2 sensor to the EFIE. And the Downstream side is reading 94-98mv from the O2 sensor up to the EFIE. Can U tell me what range in millivolts I need to increase the Upstream side to AND what range should I increase the Downstream side to see INCREASES in my MPG's.

In general, I would put the downstream EFIE at about 200 mv and I would just leave it there.

The best upstream setting can vary widely, but starting at about 250 mv should be a pretty good starting point. But note, to lean the mix further, you make the digital EFIE's voltage (at the test points) lower.